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September Weather in La Union, El Salvador

Last updated: August 23, 2025

In La Union, El Salvador, the average temperature in September hovers around 28°C (82°F), with daily highs reaching up to 31°C (88°F) and lows dipping to a comfortable 25°C (76°F). During this month, expect considerable rainfall with 314 mm (12.3 in) of precipitation spread over 25 days. Humidity levels are typically high, averaging around 77%, creating a warm and tropical atmosphere.

September Temperature in La Union

In September in La Union, the average temperature is 28°C (82°F). Maximums can reach 31°C (88°F), and minimums can be as low as 25°C (76°F). This makes it an ideal time for travelers seeking warm weather and comfortable conditions for outdoor activities.

September Weather in La Union: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in La Union, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In La Union, September typically has an average temperature of 28°C (82°F), with highs reaching up to 31°C (88°F) and lows dropping to around 25°C (76°F).
JanFebMarAprMayJunJulAugSepOctNovDec828283838282848382818282
Data source: Temperature data for La Union generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in La Union

In La Union in September, the precipitation amount is 314 mm (12.3 in) over a span of 25 days.

September Precipitation Trends in La Union

The chart displays monthly precipitation patterns in La Union, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In La Union, September typically receives around 314 mm (12.3 inches) of precipitation spread over approximately 25 days.
JanFebMarAprMayJunJulAugSepOctNovDec2343727633576259314431593
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in La Union

In La Union in September humidity is 77%. With an average temperature of 28°C (82°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities sticky and exhausting, but also offers a lush vibrancy to the landscape, perfect for enjoying leisurely strolls in the early morning or late afternoon.

September Average Humidity in La Union

This chart illustrates the average monthly humidity levels in La Union, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in La Union is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec63%62%59%59%59%68%78%79%77%77%75%67%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in La Union

In La Union in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in La Union.

Maximum UV Index Levels in La Union for September

The chart shows the monthly maximum UV Index (UVI) for La Union in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in La Union typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10121414141413131313109
Data source: La Union September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in La Union Compares to Other Months

Weather in La Union varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in La Union, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in La Union, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather28°C (82°F)2 mm (0.1 inches)63%very high
February Weather28°C (82°F)3 mm (0.1 inches)62%extreme
March Weather28°C (83°F)4 mm (0.2 inches)59%extreme
April Weather28°C (83°F)37 mm (1.5 inches)59%extreme
May Weather28°C (83°F)275 mm (10.8 inches)59%extreme
June Weather28°C (83°F)335 mm (13.2 inches)68%extreme
July Weather29°C (85°F)76 mm (3.0 inches)77%extreme
August Weather28°C (83°F)259 mm (10.2 inches)79%extreme
September Weather28°C (82°F)314 mm (12.3 inches)77%extreme
October Weather27°C (81°F)431 mm (17.0 inches)77%extreme
November Weather28°C (83°F)59 mm (2.3 inches)75%very high
December Weather28°C (82°F)3 mm (0.1 inches)66%very high

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